os_linux_zero.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2010 Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26  static void setup_fpu() {}
27
28  static bool is_allocatable(size_t bytes);
29
30  // Used to register dynamic code cache area with the OS
31  // Note: Currently only used in 64 bit Windows implementations
32  static bool register_code_area(char *low, char *high) { return true; }
33
34  // Atomically copy 64 bits of data
35  static void atomic_copy64(volatile void *src, volatile void *dst) {
36#if defined(PPC) && !defined(_LP64)
37    double tmp;
38    asm volatile ("lfd  %0, 0(%1)\n"
39                  "stfd %0, 0(%2)\n"
40                  : "=f"(tmp)
41                  : "b"(src), "b"(dst));
42#elif defined(S390) && !defined(_LP64)
43    double tmp;
44    asm volatile ("ld  %0, 0(%1)\n"
45                  "std %0, 0(%2)\n"
46                  : "=r"(tmp)
47                  : "a"(src), "a"(dst));
48#else
49    *(jlong *) dst = *(jlong *) src;
50#endif
51  }
52